When reliable performance is a must, go with these 3M™ Scotchlok™ Butt Connectors for your projects. The seamless, non-insulated barrels have chamfered ends, so pre-stripped stranded wires insert easily, and the electrolytic copper construction provides good conductivity. These connectors resist corrosion with their tin-plated finish, and built-in wire stops help you position wires correctly with no fuss. For proper hold, both ends of the connector must be crimped. These connectors are safe to use as they are UL Listed, CSA Certified and RoHS 2011/65/EU Compliant.